A new study published in the journal Human Reproduction Update finds that sperm counts are down for men on a few continents around the globe.

A new analysis reviewed 200 studies of more than 42,000 men in 50 different countries between 1973 and 2011. It found a 59 percent decline in total sperm count and a 52 percent drop in sperm concentration for men in North America, Europe, Australia and New Zealand.

But the study also found no significant sperm count declines for men in South America, Asia and Africa.

The study did not look into why the sperm counts were down. But experts suggest that certain chemicals could play a role in the decline as some can harm the male reproductive system.

More information about the study can be found HERE.